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810 articles found
Food & nutrition
Caffeine is one of the most commonly consumed stimulants in modern society and is found in various foods and beverages, including coffee, tea, and chocolate. Many people start thei
Film & media
Why does a film stay gripping even when we never learn what is in the briefcase everyone is chasing? This article explains the MacGuffin, a story device that is vital to the charac
Statistics
Simpson's paradox is the phenomenon in which a relationship seen within separate groups weakens or even reverses when the groups are combined. This article covers its definition, w
Physics
Why can a full glass of water bulge above the rim without spilling, and how do water striders walk on ponds? This article explains how surface tension arises, why water's is unusua
Earth science
Waves are a natural phenomenon commonly seen at the beach, but their formation and behavior involve highly complex and varied processes. Understanding waves plays an important role
Journalism & communication
A news embargo (Embargo) is one of the terms frequently encountered in the modern media environment. The embargo system, which sets a reporting time in advance to prevent informati
Physics
Total internal reflection happens when light traveling from a material with a higher refractive index toward a lower one hits the boundary beyond the critical angle and is reflecte
General knowledge
Why can contact lists grow while deep ties stay few? Dunbar’s Number says humans can sustainably keep only so many stable relationships—often about 150—layered as roughly 5, 15, 50
Statistics
What the null and alternative hypotheses are, how to set them up for hypothesis testing, how significance level and statistical power shape the results, and three worked examples f
Psychology
Too little tension and we drift; too much and our minds go blank. This article traces the Yerkes-Dodson Law from the original 1908 mouse experiment to the inverted-U curve, explain
Earth science
A caldera is a large, round basin that forms when the ground above an emptied magma chamber collapses. Learn how it differs from a crater, how it forms, famous calderas around the
Economics
Why can good products disappear from a market where buyers cannot judge quality? This article covers Akerlof's 1970 paper, how adverse selection drives good goods out, examples bey
